---
order: 1
title: Post Process Effects
---

## Bloom

[API](/apis/core/#BloomEffect)

<Image src="https://gw.alipayobjects.com/zos/OasisHub/99928a81-72c2-45f3-90ba-b51117e01715/image-20240719122439611.png" />

The Bloom effect adds a halo-like quality to images.

### Properties

- **Down Scale**: Controls the starting resolution of the bloom post-processing. The default is `Half`, meaning the initial downsampled resolution is half of the canvas. If precision is not a major concern, it can be switched to `Quarter` to save resources, reducing it to 1/4 of the canvas.

<Comparison
  leftSrc="https://gw.alipayobjects.com/zos/OasisHub/b537d126-863e-4387-b6a6-7c4f042029ca/image-20240726114458404.png"
  leftText="Half"
  rightSrc="https://gw.alipayobjects.com/zos/OasisHub/b62624a6-a4f2-4c9d-964c-7742f9970c8f/image-20240726114511958.png"
  rightText="Quarter"
/>

- **Threshold**: The bloom effect filters out pixels below this brightness level. The lower the value, the larger the Bloom area. This value is in gamma space, with a default of 0.9.

<Comparison
  leftSrc="https://gw.alipayobjects.com/zos/OasisHub/47347ffb-b6c3-43f8-8008-32041c1d1d3c/image-20240726114601564.png"
  leftText="0.9"
  rightSrc="https://gw.alipayobjects.com/zos/OasisHub/ee71fee4-ab78-4848-ac46-79587e107df4/image-20240726114616577.png"
  rightText="0.5"
/>

- **Scatter**: Sets the diffusion range of the bloom effect, default is 0.7.

<Comparison
  leftSrc="https://gw.alipayobjects.com/zos/OasisHub/38833509-dac2-4a97-bf55-6c1d85ec17c6/image-20240726115106399.png"
  leftText="0.3"
  rightSrc="https://gw.alipayobjects.com/zos/OasisHub/352d7efb-3c61-4cef-bc7f-7405faa7b121/image-20240726115129010.png"
  rightText="0.8"
/>

- **Intensity**: The strength of the bloom effect.

<Comparison
  leftSrc="https://gw.alipayobjects.com/zos/OasisHub/8555a001-d1b6-4a2c-8687-ad322e841071/image-20240726115441141.png"
  leftText="1"
  rightSrc="https://gw.alipayobjects.com/zos/OasisHub/8391bd7e-feeb-4351-b65e-9c1352bfb032/image-20240726115350389.png"
  rightText="2"
/>

- **Tint**: The tint color for the bloom effect.

<Comparison
  leftSrc="https://gw.alipayobjects.com/zos/OasisHub/ae9ce1a2-9075-4739-9162-c0e5ff6b8ad1/image-20240726115519606.png"
  leftText="White"
  rightSrc="https://gw.alipayobjects.com/zos/OasisHub/796ec758-bf4e-45df-8050-67f88ad174b8/image-20240726115534397.png"
  rightText="Red"
/>

- **Dirt Texture**: Adds smudges or dust to the bloom effect using a dirt texture.

<Comparison
  leftSrc="https://gw.alipayobjects.com/zos/OasisHub/8a9b9fdb-191e-4ec9-bb38-ab0877fbde68/image-20240726115722323.png"
  leftText="Off"
  rightSrc="https://gw.alipayobjects.com/zos/OasisHub/a711bdd0-95a0-4f88-85fc-8f533569635d/image-20240726115736031.png"
  rightText="On"
/>

- **Dirt Intensity**: The intensity of the dirt texture.

<Comparison
  leftSrc="https://gw.alipayobjects.com/zos/OasisHub/a711bdd0-95a0-4f88-85fc-8f533569635d/image-20240726115736031.png"
  leftText="1"
  rightSrc="https://gw.alipayobjects.com/zos/OasisHub/451dff04-fc7b-4e40-9a3c-76dce3ff81c8/image-20240726115803813.png"
  rightText="5"
/>

## Tonemapping

[API](/apis/core/#TonemappingEffect)

<Image src="https://gw.alipayobjects.com/zos/OasisHub/d326f3fb-0d04-493c-8714-93cd4c5924ae/image-20240719122505552.png" />

Tonemapping remaps the HDR values of an image, improving the overall contrast and color saturation.

<Callout type="positive">
  Tonemapping is generally used after enabling [HDR mode on the camera](/en/docs/graphics/postProcess/postProcess/#2相机开关).
</Callout>

For example, enabling ACES tonemapping in the image below increases the dynamic range in sun-exposed areas, revealing more details:

<Comparison
  leftSrc="https://gw.alipayobjects.com/zos/OasisHub/8ec8f8e0-0054-48c9-aeb1-146b745ac996/image-20240726114047059.png"
  leftText="Tonemapping Off"
  rightSrc="https://gw.alipayobjects.com/zos/OasisHub/9bbb75f2-8ed2-4448-930f-960da82ed298/image-20240726114242977.png"
  rightText="Tonemapping On"
/>

### Properties

- **Mode**: Tonemapping algorithm. You can choose between `Neutral` and `ACES`. The `Neutral` mode is particularly suitable for situations requiring only range remapping with minimal impact on tone and saturation. The `ACES` mode uses the cinematic ACES reference color space, which can produce film-like contrast effects but is more consuming in performance.

<Comparison
  leftSrc="https://gw.alipayobjects.com/zos/OasisHub/8eaed6b4-ceb6-4e05-927e-eb02b1f76aaa/image-20240726114338413.png"
  leftText="Netural"
  rightSrc="https://gw.alipayobjects.com/zos/OasisHub/9bbb75f2-8ed2-4448-930f-960da82ed298/image-20240726114242977.png"
  rightText="ACES"
/>